From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Richard Torrens (lists)" Date: Tue, 03 Mar 2020 12:17:39 +0000 Subject: Re: [mlmmj] DMARC (corrected) Message-Id: <584b6eaaf7Lists@Torrens.org> List-Id: References: <20200303095859.Horde.WCHP_tNDxpm70b-4WXMAcYP@andreasschulze.de> In-Reply-To: <20200303095859.Horde.WCHP_tNDxpm70b-4WXMAcYP@andreasschulze.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: mlmmj@mlmmj.org In article <20200303095859.Horde.WCHP_tNDxpm70b-4WXMAcYP@andreasschulze.de>, A. Schulze wrote: > Christof Thalhofer: > > They say, reject every mail that is supposed to come from casema.nl but > > was sent from a server not being part of this domain. > Hello, > I like to correct the wording: > p=reject aks the receiving MTA to reject messages with RFC5322.From = > *@casema.nl > unless the message could be successful authenticated by SPF or DKIM. dig is a tool I was not aware of. Unfortunately the response is not exactly clear so thanks fot the exp;anation. > That open two options > - auth by SPF > usually happen for directly sent messages from the originators MTA > unlikely to happen for messages sent via an MLM as such hosts > aren't expected to be included in senders SPF > - auth by DKIM > very common for MLM to break DKIM signatures by > * adding a subject tag > * adding a footer to mail body > So, as MLM operator you /may/ make your lists "dkim save": strictly > avoid any message modification. > Then any subscriber could use your MLM even if the subscriber announce > dmarc p=reject Yes - I got this much earlier: I used to add a footer and an i/d to the subject. But removing them has not changed things. It seems to me that I need to remove the original From and insert subjects such as From: thelist Original-sender: theposter But there seems to be no way of inserting the original poster's email address in a new header? -- Richard Torrens. http://www.Torrens.org for genealogy, natural history, wild food, walks, cats and more!